Device for limiting a working stroke of a hydraulic cylinder

Details Device for limiting a working stroke of a hydraulic cylinder Device for limiting a working stroke of a hydraulic cylinder

1992-05-21

1993-08-24

Look, Edward K.

Motors: expansible chamber type

Constantly applied motive fluid with controlled venting

91380, 91389, 91390, 91400, F15B 1302

Patent

active

052379051

ABSTRACT:
A device for limiting a working stroke of a hydraulic cylinder has a working cylinder and a working piston comprising a hollow piston rod connected to its top portion. A pressure reservoir is connected to a first working chamber for constantly supplying a pressure medium thereto, and a pressure source is connected via an inlet line to a second working chamber for supplying a pressure medium thereto. A shut-off valve comprises a push piston and a return spring for holding the push piston in its closed position. A drag link is slidably connected inside the push piston and extends through the working piston into the interior of the hollow piston rod. One end of the drag link has a first abutment that comes into contact with the working piston before the working piston reaches its end position. The other end of the drag link comprises an annular abutment which, when the first abutment is in contact, moves the push piston in the opening direction until a position of equilibrium is reached in which the working piston is hydraulically held in its end position. The shut-off valve is alternately actuatable by two actuating pistons.

REFERENCES:
patent: 2018977 (1935-10-01), Spellman et al.
patent: 2982259 (1961-05-01), Lan
patent: 5081902 (1992-01-01), Rausch

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